Abstract
This article describes a broadcast-quality 45 Mbit/sec television coder/decoder that can transmit on a standard DS3 facility and receive a single time-base-corrected System-M/NTSC video signal and several audio signals. The coder uses an adaptive combination of pulse-code modulation (PCM) and adaptive differential PCM with four predictors. The audio and ancillary signals are carried in an asynchronous DS1 signal that is part of the DS3 coder output. The DS3-level C-bits contain information that can be used to control a dedicated tree-type transmission network. The aim of this coder/decoder is to effectively transmit broadcast-quality television signals (525 line, 59.94 fields/sec) for distribution and contribution applications on 44.736 Mbit/sec(DS3) facilities using fiber, microwave radio, coaxial, or other digital transmission technologies.
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